Okuto Kotsubo  

, 小壷 奥人

The physical education teacher at Yokai Academy is a pervert who targets female students. He tried to take advantage of Mizore but was stopped by Kotsubo, resulting in him being frozen. When he returned, Kotsubo attempted to expel Mizore and even tried to kill her. However, Tsukune defeated him with the help of Mokas blood infusion and exposed his actions to the whole school. In the anime, it is revealed that Mizore did not have feelings for Kotsubo and was almost taken advantage of while crying over Tsukune.